export const ADD_TODO='ADD_TODO';
export const TOGGLE_TODO='TOGGLE_TODO';
export const SET_VISIBILITY_FILTER = 'SET_VISIBILITY_FILTER';

export const VisibilityFilters = {
    SHOW_ALL: 'SHOW_ALL',
    SHOW_COMPLETED: 'SHOW_COMPLETED',
    SHOW_ACTIVE: 'SHOW_ACTIVE'
  }

 /***
  * action 创建函数
  * 
  */
 export function addTodo(text){
     return{
         type:ADD_TODO,
         text
     }
 }

 export function toggleTodo(index){
     return{
         type:TOGGLE_TODO,
         index
     }
 }
 export function setVisibilityFilter(filter) {
    return { type: SET_VISIBILITY_FILTER, filter }
  }